# Keliling & Luas Segitiga Rumadi

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Quizzes Created: 3 | Total Attempts: 2,784
Questions: 7 | Attempts: 2,016

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• 1.

### Pada gambar segitiga dibawah ini, panjang KL = b = 12 cm, KM = ML = a = 10 cm, dan MN = c  = 8 cm, maka kelilingnya  adalah ....

Explanation
The perimeter of the triangle is calculated using the formula K = 2a + b. In this case, a is given as 10 cm and b is given as 12 cm. Plugging these values into the formula, we get K = 2(10) + 12 = 32 cm. Therefore, the perimeter of the triangle is 32 cm.

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• 2.

### Pada gambar segitiga dibawah ini, panjang KL = b = 12 cm, KM = ML = a = 10 cm, dan MN = c = 8 cm, maka luasnya  adalah ....

Explanation
The formula to calculate the area of a triangle is 0.5 x base x height. In this case, the base (b) is given as 12 cm and the height (c) is given as 8 cm. Plugging these values into the formula, we get 0.5 x 12 x 8 = 48 cm. Therefore, the area of the triangle is 48 cm.

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• 3.

Explanation
The given explanation shows the calculation of the perimeter of triangle KLM. It states that the perimeter (K) is equal to the sum of the lengths of the three sides KL, ML, and MK. It then shows the calculation of the perimeter using the given values, which results in 42. The answer also includes the unit of measurement (cm) to indicate that the perimeter is measured in centimeters.

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• 4.

### Luas segitiga PQR dibawah ini adalah ....

Explanation
The given explanation shows the calculation of the area of a triangle using the formula L = ½ x base x height. The base and height of the triangle are given as 9 and 6 respectively. By substituting these values into the formula, the calculation is done step by step, resulting in the final answer of 27 cm square.

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• 5.

### Segitiga ABC mempunyai panjang AB = ( 2x - 1 ) cm, BC = ( x + 5 ) cm, dan AC = 3x cm, sedangkan kelilingnya = 46 cm, maka panjang AB adalah ....

Explanation
The given explanation solves for the value of x by setting up the equation for the perimeter of the triangle, K = (2x - 1) + (x + 5) + 3x. It then simplifies the equation and solves for x, which is found to be 7. Finally, it substitutes the value of x into the equation for AB to find the length of AB, which is 13 cm.

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• 6.

### Segitiga ABC siku - siku di A mempunyai panjang AB = ( 3x - 11) cm, BC = 20 cm, dan AC = 12 cm, sedangkan luasnya = 96 cm persegi, makanilai x adalah ....

Explanation
The given explanation shows the steps to find the value of x in the equation. It starts by using the formula for the area of a triangle, which is ½ x base x height. The base (AB) is given as (3x - 11) cm and the height (AC) is given as 12 cm. The area is given as 96 cm^2. By substituting the values and simplifying the equation, we can solve for x. The final answer is x = 9 cm.

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• 7.

### Segitiga ABC, Dengan panjang AB = 4 cm, BC = 6 cm, dan AC = 8 cm , maka luas segitiga ABC tersebut adalah ....

Explanation
The given solution calculates the area of triangle ABC using the formula for the area of a triangle, which is 1/2 * base * height. The length of AB is given as 4 cm, BC as 6 cm, and AC as 8 cm. The formula for the area is then simplified to 1/2 * 6 * 8, which equals 24 cm^2. However, the given solution calculates the area incorrectly by using a different formula and arrives at the answer of 11.6.

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